简介:Alowpoweratmosphericpressureplasmajetdrivenbya24kHzACpowersourceandoperatedwithaCH4/airgasmixturehasbeeninvestigatedbyopticalemissionspectrometer.Theplasmaparametersincludingtheelectronexcitationtemperature,vibrationaltemperatureandrotationaltemperatureoftheplasmajetatdifferentdischargepowersarediagnosedbasedontheassumptionthatthekineticenergyofthespeciesobeystheBoltzmanndistribution.TheelectrondensityatdifferentpowerisalsoinvestigatedbyHβStarkbroadening.Theresultsshowthattheplasmasourceworksundernon-equilibriumconditions.Itisalsofoundthatthevibrationaltemperatureandrotationaltemperatureincreasewithdischargepower,whereastheelectronexcitationtemperatureseemstohaveadownwardtrend.Theelectrondensityincreasesfrom0.8×1021m-3to1.1×1021m-3whenthedischargepowerincreasesfrom53Wto94W.
简介:ThispaperpresentsabriefoverviewofCO2reformingofCH4(CRM)byvariousformsof'arc'plasma,whichismoresuitabletoCRM,andtheenergyefficiencyisusedtoevaluatedifferentplasmaprocessesspecifically.Accordingtothereportedresults,thearcthermalplasmawithbinodeexhibitedbetterperformance.Moreover,theplasmaCRMprocesswascomparedwiththereportedplasmasteamreformingofCH4(SRM)process,andtheresultsshowedthattheformerprocesshasadvantagesonenergyefficiencyandCH4consumption.Additionally,itisbelievedthattheplasmaCRMprocesswouldbecompetitivewiththeconventionalSRMprocessinbothenergyefficiencyandCO2emissiononcetheheatmanagementisemphasizedandtherenewablepowerisused.Finally,aconceptofplasmareactorforindustrialapplicationisproposed.
简介:Netemissioncoefficientsofradiationwerecalculatedforisothermalplasmaofmethaneasafunctionoftheplasmatemperature5,000~30,000Kandthearcradius0mmto10mmatatmosphericpressure.Calculationstakeintoaccountcontinuumandlineradiations,specialattentionhasalsobeengiventotheinfluenceofoverlappingspectrallines.ThelineshapesinourcalculationsaregivenbyconvolutionofDopplerandLorentzprofiles,resultinginasimplifiedVoigtprofile.Inthecaseofahydrogenprofile,weusedtheVidaltables,andthefourfirstLymanlinesandthefourfirstBalmerlineswereconsidered.Thiscalculationwascarriedoutontheassumptionoflocalthermodynamicequilibriumandinanondiffusiveenvironment.ThenetemissioncoefficientcalculationforpureargonplasmawascomparedwiththeexperimentalresultsofEvansinourpreviouswork.Weusedtheescapefactor,andourresultswerehigherthanthoseoftheexperiment.Inthispaper,weexplainwhy,usingtheescapefactor,theradiationisoverestimated.ThenetemissioncoefficientobtainedfromarealspectrumwascomparedwithEssoltaniwork’swhichusedtheline-by-linemethodforpureargonplasma.
简介:Attheambienttemperatureandpressureaglowdischargeplasmawasusedasanewapproachforthecouplingofmethanewiththenewly-developedrotarymultidentatehelixelectrode.Inthepresenceofhydrogen,theeffectsoftheinputpeakvoltagesandgasflowratesonmethaneconversion,C_2singlepassyieldandselectivitywereinvestigated,andthentheresultswerecomparedwiththosefromthethree-discmultidentateelectrode.Thisdemonstrated,onanexperimentalscale,thattherotarymultidentatehelixelectrodewasbetterthanthemultidentatethree-discelectrodeastherewaslittleaccumulationofcoke,andtheC_2yieldperpasswas69.85%andC_2selectivityover99.14%with70.46%methaneconversionataninputpeakvoltageof2300Vand60ml/mingasflowrate.
简介:用NPL防护水平次级标准NE2550剂量率仪对国防计量系统和有关厂矿的防护水平60Co和187Csγ辐射场进行了照射量率的测量和反平方律的检验,并作了照射量率的比对。137Csγ辐射场照射量率最大相差+3.6%(2.58×10-6-2.58×10-4Ckg-1h-1),而60Coγ辐射场最大相差分别为+1.4%(2.58×10-4-2.58×10-3Ckg-1h-1)、+9.9%(2.58×10-6-2.58×10-4Ckg-1h-1)和+24.5%(2.58×10-7-2.58×10-6Ckg-1h-1)。60Co和137Csγ辐射场的照射量率,在一定的距离范围内反平方律在±5%以内符合。
简介:本文旨在通过蒙特卡罗(MC)理论模拟计算方法来确定地面放射性测量模型标准(Y系列模型体源)表面中心点上方不同高度的剂量率/比释动能率,为将我国地面放射性测量模型标准转化为环境电离辐射模型体源标准提供理论依据。在建立MC数学理论模型的基础上,采用MCNP模拟计算软件计算Y系列模型体源表面中心点上方不同高度的空气吸收剂量率/空气比释动能率,由此,拟合出了能客观反映我国模型体源表面上方单位放射性核素含量的空气吸收剂量率/空气比释动能率,并对其计算结果与其它实验方法实测的结果(G(E)函数法、高气压电离室法、TLD法)进行了比对,比对结果在10%内符合;同时对其计算结果的不确定度进行了评定,其合成标准不确定度为3.0%。